Advertisements
Advertisements
प्रश्न
The circumference of a circle is equal to the perimeter of a square. The area of the square is 484 sq.m. Find the area of the circle.
उत्तर
Let the side of the square = s and the radius of the circle = r
∴ 2πr = 4s
But, the area of the square 484m2
∴ the side of the square
= `sqrt(484)`
= 22m
⇒ 2πr
= 4 x 22 ∈ r
= 14m
The Area of a Circle with radius r = πr2
The Area of a Circle with radius 14
= π(14)2
= `(22)/(7) xx (14)^2`
= 616m2.
APPEARS IN
संबंधित प्रश्न
In Figure , two concentric circles with centre O, have radii 21cm and 42 cm. If ∠ AOB = 60°, find the area of the shaded region. [use π=22/7]
A square water tank has its side equal to 40m, there are 4 semicircular flower beds grassy plots all around it. Find the cost of turfing the plot at Rs 1.25/sq.m
The circumference of a circle is 22 cm. Find the area of its quadrant.
The areas of two circles are in the ratio 4: 9. What is the ratio between their circumferences?
In the given figure, APB and AQO are semicircles and AO = OB. If the perimeter of the figure is 40 cm, find the area of the shaded region.
A horse is placed for grazing inside a rectangular field 70 m by 52 m. It is tethered to one corner by a rope 21 m long. On how much area can it graze? How much area is left ungrazed?
The area of a circle is 38.5 cm2. The circumference of the circle is
Sand from a cylindrical bucket 32 cm in height and 18 cm in radius is poured onto the ground making a conical heap 24 cm high. Find the radius of the conical heap.
The speed of a car is 66km per hour. If each wheel of the car is 140cm in diameter, find the number if revolution made by each wheel per minute.
